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author

Karen Vilas
Murtaza Gandhi
Anthony Sarrack
William Mather

published on

June 2020

This document holistically identifies the need for timely and reliable detection of hazardous gases as well as design of a leak tight SIP location:

  • minimize ingress of hazardous gas (flammable or toxic) into the SIP building
  • establish effective barriers to minimize infiltration once the ventilation system has been isolated, and
  • develop an effective evacuation plan in the event the SIP is compromised.

This guidance document closes a significant gap in the understanding and use of SIP as a strategy for risk mitigation.

Foreword Excerpt:

For over 35 years, I have been conducting risk analysis studies on a range of facilities and transportation systems with flammable and toxic hazards. Having conducted hundreds of such analyses, I have evaluated a variety of risk mitigation systems and strategies to manage risks including complex mitigation systems to address hazards associated with highly toxic materials.

While Shelter-in-Place (SIP) has been a common mitigation strategy to mitigate public risk in the event of a toxic release from an operating facility, the use of SIP strategy for onsite personnel protection introduces additional complexities and considerations that should be accounted for in the strategy. However, in all the years I have been conducting risk analysis studies, I have found very few locations that have a good holistic approach to SIP. This became even more evident when, in discussions and deliberations during my participation on the Version 4 and Version 5 Committees to
develop API RP 751: Safe Operation of Hydrofluoric Acid Alkylation Units, I was unable to identify a single document that described a comprehensive approach to using SIP to mitigate toxic risk.

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Karen Vilas

Murtaza Gandhi

Anthony Sarrack

William Mather